US7213660B2 - Washpipe seal - Google Patents

Washpipe seal Download PDF

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Publication number
US7213660B2
US7213660B2 US11/427,196 US42719606A US7213660B2 US 7213660 B2 US7213660 B2 US 7213660B2 US 42719606 A US42719606 A US 42719606A US 7213660 B2 US7213660 B2 US 7213660B2
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United States
Prior art keywords
fluid
stators
seal assembly
rotors
drilling fluid
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
US11/427,196
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English (en)
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US20070007044A1 (en
Inventor
Kevin J. Martin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF USA Inc
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SKF USA Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from US11/174,687 external-priority patent/US20070007002A1/en
Application filed by SKF USA Inc filed Critical SKF USA Inc
Priority to US11/427,196 priority Critical patent/US7213660B2/en
Priority to PCT/US2006/025518 priority patent/WO2007005576A2/fr
Priority to EP06785928A priority patent/EP1899571A2/fr
Priority to CA002613872A priority patent/CA2613872A1/fr
Assigned to SKF USA INC. reassignment SKF USA INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MARTIN, KEVIN J.
Publication of US20070007044A1 publication Critical patent/US20070007044A1/en
Publication of US7213660B2 publication Critical patent/US7213660B2/en
Application granted granted Critical
Priority to NO20080057A priority patent/NO20080057L/no
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B21/00—Methods or apparatus for flushing boreholes, e.g. by use of exhaust air from motor
    • E21B21/02—Swivel joints in hose-lines
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B2200/00—Special features related to earth drilling for obtaining oil, gas or water
    • E21B2200/01—Sealings characterised by their shape

Definitions

  • the present invention relates generally to so-called washpipe seals and more particularly, to a washpipe seal which is adapted to permit controlled leakage of a small portion of high pressure drilling fluid which largely passes into the so-called washpipe and into the drill string which is attached thereto.
  • a so-called swivel assembly incorporates a seal at the washpipe to confine the major portion of the drilling fluid to the washpipe.
  • This drilling fluid is sometimes colloquially referred to as “drilling mud” or simply “mud.”
  • abrasive fluids which are sent down to the bore hole through the washpipe and the drill string, and ultimately to the drill motor which is held at the bottom of the drill string.
  • This abrasive fluid is supplied to the motor which drives the cutting tools under very high pressure, e.g. 5,000 PSI to 7,500 PSI or even 10,000 PSI or more.
  • a seal is necessary between the non-rotary upper connection assembly and the rotary lower connection assembly to prevent undue leakage of this drilling fluid to the outside.
  • the drilling fluid leakage is taken from the vicinity of the washpipe back to a remote container where it is again picked up and supplied to the drill string.
  • the joint in question is between the upper connection assembly, which includes a housing for the stator assembly and the lower connection assembly which includes the rotor assembly and which is affixed to and rotates with the drill string.
  • the rotor and housing are sometimes collectively referred to as a “cartridge.”
  • the leakage of the drilling fluid which is operated from 5,000 PSI up to perhaps 10,000 PSI or more for example, is led through a labyrinth between alternating rotor/stator discs, which preferably include lands and grooves in each rotor/stator disc.
  • alternating rotor/stator discs which preferably include lands and grooves in each rotor/stator disc.
  • the drilling fluid in one embodiment gradually is subject to a reduced pressure and ultimately achieves a low pressure and passes to an outlet, where it is led via a conduit back to the source of drilling fluid.
  • the drilling fluid passes back into the washpipe and undergoes a repetition of the cycle.
  • only a very small portion of the drilling fluid escapes through the labyrinth seal compared to the portion of drilling fluid directed down the drill string, and the seal of the invention may thus be considered a controlled leakage seal.
  • the force of the controlled leakage drilling fluid is opposed by grease within the labyrinth, whereby the grease fills most or all of the labyrinth and is present at what, in another embodiment, would be the inlet for the drilling fluid.
  • the grease thus passes backwardly through the labyrinth of rotors and stators up to the approximate point of entry of the drilling fluid.
  • the drilling fluid is sealed at the top rather than at the bottom of the labyrinth, and the grease extends back and totally fills the labyrinth defined by the rotors and stators.
  • the cartridge comprising the housing, or the fixed portion of the cartridges
  • the rotor and its included portions will need to be replaced or serviced, often fairly frequently, during the continuation of their operation.
  • the manner in which the fixed housing and the rotor have been hooked up is such that, in order to maintain it or replace parts, the system would have to be disabled, and the parts taken apart by unscrewing them on one or both sides. Thereafter, removing them would be extremely difficult because of the structure surrounding the washpipe unit.
  • a structure that could permit the ready removal of the housing and rotor, sometimes collectively called the cartridge, and permit replacement of them with very little or no difficulty would be highly desirable. This is done by providing a master coupling with at least one opening and preferably by attaching the cartridges with flanges which are clamped together and easily taken apart.
  • stator discs and the rotor discs are interleaved and arranged with very small clearance spaces between them. Consequently, in the stator unit there are a plurality of spacers, with a stator disc between each set of spacers. Also, there are a plurality of rotors, each one in turn separated by spacers. Consequently, there is an alternating stack of interleaved rotors and spacers which maintain the desired clearance.
  • Each disc in one embodiment, has a plurality of grooves of perhaps 0.005 to 0.050 inches, as well as a large plurality of lands which extend into the grooves, perhaps 0.005 to 0.040 inches by way of example.
  • Each of the stator spacers and the rotor spacers is preferably held snugly in the desired configuration of a stack by Belleville washers or other similar units, and each of the spacers includes an O-ring or similar packing to ensure the correct alignment and spacing and to insure that there is no leakage through a secondary route.
  • the spacers are held snugly in place by Belleville washer and the o-rings under compression.
  • the rotor disks and the stators are held onto the inner and outer housings by keyways having locking pins associated with them, as will appear.
  • At the top of one embodiment of the novel rotor/stator assembly of the invention is an annular space between sections of the housing and above the labyrinth.
  • the drilling fluid pressure at this point is perhaps 5,000 to 10,000 PSI, but by reason of passing through the extended labyrinth with perhaps 16 to 20 reversals of radial direction and 16 to 20 axial movements as the drilling fluid moves along a tortuous path, the pressure confining the axial fluid gradually lowers until the fluid reaches the outlet, where it is under relatively low pressure and relatively low flow.
  • the washpipe and the housing are preferably made from an oil field grade of steel and the rotor and stator its associated parts are made from tungsten carbide or other wear-resistant alloys, or other materials with wear-resistant coatings which are also used to provide radial and thrust bearings where the washpipe meets the upper housing. Such parts could also be made from ceramics or other like material. These bushings or bearings are greased through one or more fittings and grease passages which are provided for that purpose.
  • a known type of seal or packing is used between the lowermost portion of the washpipe and the stator and rotor housings, but this seal or packing sees only the reduced or lowermost pressure which is sensed at the outlet for the drilling fluid and accordingly, such seal is not exposed to high pressure in use.
  • a further object of the invention is to provide a washpipe seal wherein the high pressure drilling fluid moves gradually from a region of very high pressure, to a low outlet pressure from where it preferably is returned to the storage point for reuse.
  • Another object is to provide a seal which includes a housing for a plurality of stators and a housing for a plurality of rotors, with the stators and rotors being of annular disc form and being interleaved with one another.
  • a still further object of the invention is to provide a plurality of stators and rotors having interleaved portions and wherein each stator and rotor preferably includes a plurality of lands and grooves or other formations to retard the flow of drilling fluid as it works it way from the inlet chamber of the seal assembly to the outlet at the bottom portion thereof.
  • a still further object of the invention is to provide a plurality of alternating rotors and stators of annular form in which each includes a seal or packing that prevents leakage between the two sets of stators and rotors.
  • Another object of the invention is to provide a seal with a housing having a lower end member disposed in opposed relation to another housing member, the two being separated by thrust bearings and/or radial bearings each able to be greased, and maintaining such respective housings in closely spaced apart relation.
  • a further object is to provide a plurality of stators and rotors, each of which is held in place by a spacer, with the array of spacers being held in fixed position under a compressive load provided by spring means such as Belleville washers, for example.
  • Another object is to provide a construction wherein the stators are located for anti-rotation and the rotors are located for rotation by means of keyways and locking pins positioned on the outside diameter of the stator disks and the inside diameter of the rotor disks. Belleville washers are used to provide a small preload to the rotor and stator stack and the clamping of the total assembly compresses the stator and rotor spacers to fix the final position, while also providing an adequate seal between the components.
  • Another object of the invention is to provide radially inner and outer housings, each having a plurality of associated discs, with the inner housing including disks of annular form and defining a cylindrical region on the interior, able to accommodate a high volume of drilling fluid, while passing a small amount of drilling fluid to the annular headspace or chamber between the two housings.
  • a still further object of the invention is to provide a seal with controlled leakage, which includes an upper connection assembly and a housing attached thereto as well as a lower connection assembly that rotates with the washpipe in the use of the seal assembly.
  • a further object of the invention is to provide a washpipe seal which may be readily removed and replaced without altering the axial distance between the two connectors, that is, those at the top and the bottom of the assembly.
  • a still further object of the invention is to provide a system which will hold two parts of the wash pipe seal in snug, non-leaking relation but which can be readily radially removed so that the cartridge can be taken out of the system and replaced with another cartridge, with very little or no difficulty, and no changing of the ultimate distance between the upper and lower pipe flanges or connectors.
  • Another object is to provide a pair of clamps which can be separated by removing two fasteners on each end and removing the clamps, thereby enabling the cartridge to be removed radially and replaced with very little difficulty.
  • a still further object is to provide a pair of clamps which act radially and not only permit ease of removal, but also provide inherent alignment and clamping forces which prevent any possible leakage when the clamps are secured.
  • the invention also includes a simplified structure permitting ready removal and replacement of the cartridge without altering the position of the master coupling, which remains in a fixed position, having two conduits fastened to it by screw threads or the like on each end.
  • FIG. 1 is a perspective view showing several important features of the present invention including showing the upper connection assembly, the lower connection assembly and the arrangement of the annular stator and rotor discs in interleaved relation;
  • FIG. 2 is an enlarged vertical sectional view through a portion of the apparatus of the present invention and showing one particular preferred arrangement of the stator housing, the rotor housing, plural annular rotors and stators for each housing and other features of the invention;
  • FIG. 3 is an exploded view of one annular stator and one annular rotor and showing them in spaced apart relation;
  • FIG. 4 is a further enlarged vertical sectional view of a portion of the stator/rotor assembly showing the stators and rotors with lands and grooves therein, and including the spacers between the rotor and stators and the seals therefor, and showing the tortuous path undergone by the drilling fluid;
  • FIG. 5 is a view similar to FIG. 4 , only showing the stators and rotors without the lands and grooves;
  • FIG. 6 is a perspective view of the cartridge holder of the present invention, showing in lighter lines the master coupling and the passages through which the removable clamp and the cartridge may be removed and replaced;
  • FIG. 7 is a perspective view showing in lighter lines the master coupling and showing the cartridge in the process of being replaced and/or renewed;
  • FIG. 8 is a vertical sectional view showing the cartridge in the process of being removed and showing the two positions of the clamp holding the cartridge in position;
  • FIG. 9 is a further enlarged view of a portion of FIG. 8 , showing several details of construction and schematically showing the keyways and locking pins o the invention, and the threaded collar allowing release of the flanges.
  • washpipe seal assembly generally designated 18
  • this assembly includes a stator assembly generally designated 20 , and a rotor assembly generally designated 22 .
  • the stator assembly 20 includes a plurality of discs generally designated 24 a, 24 b received within a housing generally designated 26 .
  • This housing 26 is affixed to an upper connection assembly generally designated 30 .
  • This assembly 30 includes a radially outer member with an O-ring 32 on its top surface 34 .
  • the inner member is preferably in the form of a collar 36 of reduced diameter relative to the housing 26 .
  • the stator housing generally designated 26 consists of the upper, reduced diameter collar 36 , an O-ring groove 38 and a radial flange 46 leading to the outer diameter cylindrical portion 35 . Adjacent the bottom of the stator housing 26 is a low pressure annular chamber 49 terminating in an outlet 50 .
  • An enlarged diameter portion generally designated 52 forming a lower continuation of the housing 26 is provided, and this element includes one or more grease fittings 54 connected to suitable passages 56 for grease to lubricate radial and thrust bearing assemblies generally designated 58 , 60 .
  • These bearings 58 , 60 are subject to harsh environmental conditions and are preferably made from a hardened steel material, or tungsten carbide, and the bearings 58 , 60 permit rotation between the stator assembly 20 and the rotor assembly 22 . Of course, these bearings also permit relative rotation of the rotor and stator and axial and radial guidance of these assemblies 20 , 22 .
  • an upper spacer unit 62 a which is fixed relative to the housing 26 by a Belleville washer 66 capable of exerting a strong axial compressive force on the entire stack of spacers 62 a, 62 b, etc. and stators 64 a, 64 b, etc.
  • the general arrangement of stacked stators 64 a, 64 b, etc. and the arrangement of spacers 62 a, 62 b, 62 c, etc. is the same arrangement as the arrangement of rotors and spacers in the rotor assembly 22 .
  • the washpipe 70 has a radial flange 72 which engages a Belleville washer 74 .
  • This Belleville washer develops an axial load on spacers 76 a, 76 b, etc. and these spacers 76 a, 76 b engage the margin portions of the rotor discs 78 a, 78 b, etc.
  • the lower connection assembly generally designated 71 , includes an axial wall 73 , a radial wall 75 , and a groove 77 accommodating an O-ring 79 .
  • the radial bearing 58 is engaged by an extension 81 of the washpipe 70 .
  • These portions may be affixed to a rotary member generally designated 80 and having radial and axial flanges 82 , 84 .
  • These components may include their own O-rings 86 , 88 as is customary in the industry.
  • spacers 62 a, 62 b, etc. hold the stators 64 a, 64 b in a relatively fixed position and allow the rotors 78 a, 78 b to rotate without radial or axial engagement of their counterparts 64 a, 64 b, etc.
  • each of the stators 64 a, 64 b, etc. has a plurality of lands or teeth 106 a, 106 b, etc. disposed in offset relation to the lands 108 a, 108 b, etc. on the rotor 78 a.
  • Grooves 110 a, 110 b are disposed in an opposed relation to the lands 108 a, 108 b, etc.
  • the stator consists of a reduced diameter collar 136 , a radial flange 146 , and a cylindrical axial flange 135 .
  • Disposed inside this cylindrical shell 135 is a spacer 162 a, sealed by an o-ring 198 a.
  • Several additional spacers 162 b, 162 c, etc. are stacked inside this cylindrical shell 135 , and the additional spacers 162 b, 162 c each include additional o-rings 198 b and 198 c.
  • the head space 196 lying between the radial flange 172 of the inner cylinder or washpipe 170 , and the radial flange 146 of the cylindrical shell 135 provides a passage 173 for drilling fluid entering the head space 196 .
  • a compressive force is maintained by Belleville washer 166 acting on the spacer 162 a and all of the components in axial alignment therewith.
  • a Belleville washer 174 bears on the inner spacer 176 a, 176 b and on the disks 178 a, 178 b entrapped between them.
  • O-rings 200 a, 200 b seal the spaces 176 a, 176 b, etc.
  • the only difference in operation between embodiment of FIG. 4 and that of FIG. 5 is that of the configuration of the rotors/stators of the invention.
  • the end face 202 of the spacer 176 a and the end face 204 of the stator designated 164 a lie in opposed relation with a small clearance 205 , such as 0.005 to 0.060 inches, by way of example, between them.
  • the horizontal space 215 between the stator 164 a and the rotor 178 a is defined by the top and bottom faces 212 , 214 of the stator 164 a and the rotor 178 a.
  • the drilling fluid passes in the space 215 between these narrow faces 202 , 204 and into the space 217 between surfaces between the surfaces 218 , 220 , and so on until the drilling fluid has reached the bottom of the chamber 49 at the lower end of the washpipe 170 .
  • the region 196 is filled with extremely highly pressurized drilling fluid, most of which travels down inside the washpipe 170 . However, a small amount of this drilling fluid is forced into to the passage 215 , 217 , etc. between the end portions and surface portions of the rotors and stators.
  • the spacers shown in the drawings are the preferred method of doing this. However it is not the only method of keeping these stators or rotors apart, since this can be done by merely forming an extension of enlarged width on the end of each rotor or stator, thereby imparting an L shape to the inboard and outboard of the stators or rotors.
  • the O-rings such as the O-rings 198 a, 198 b, the 200 a, 200 b, etc. may be replaced with any suitable kind of packing, preferably a so-called block V or the like.
  • the Belleville washer is shown as being compact and having a high spring rate which is desirable in most cases. However, a wave-type spring or washer could be used or other means having a strong spring rate to hold these elements together.
  • the invention has been described showing of lands and grooves facing each other in one embodiment, and a plain ungrooved embodiment as another choice.
  • the preferred method are the tongue and groove, or lands and grooves, method illustrated or the plain, unadorned faces.
  • the size of this space it has been found that the most effective space depends upon the viscosity and pressure of the drilling mud, but having the lands and grooves with 0.005 to 0.050 is preferred. Some other values may be used if desired.
  • the packing 90 has been illustrated as the most economical and effective method of creating a seal between the relatively low pressures involved at the bottom of the chamber. Needless to say, however, another type of seal could be used in this application.
  • Another entirely different method could use the apparatus of the present invention with no change or with only a slight change in the apparatus.
  • the spaces between the rotors and the stators could be filled with grease up to approaching, or even meeting, the headspace 96 .
  • the grease would have to be injected into the apparatus while there were no countervailing high pressure from the drilling mud.
  • the seal would otherwise, function as designed, with the drilling and pressure being counteracted with the resistance to movement of the grease.
  • the two housings, the stators and the rotors and other parts are made from tungsten carbide or similar material, since these components see the highest pressure drilling fluid.
  • Other components use an oil field grade steel.
  • the o-rings and the block V or similar type seals are made from synthetic rubber or other known material.
  • FIGS. 6–9 show a slightly modified form of the invention but one which greatly simplifies the removal of the entire cartridge shown in FIGS. 6–9 .
  • cartridge is meant a removable part which includes the outer housing and the inner rotor and all their associated elements.
  • the master coupling 288 which secures the upper and lower passages 290 , 292 together in fixed axial relation and the master coupling 288 includes two enlarged openings 294 , 296 .
  • FIGS. 6–8 there is shown a large lower flange generally designated 300 and an equally large upper flange generally designated 302 .
  • These elements are essentially the same as their counterparts in FIGS. 1 and 2 .
  • the main difference between these embodiments is that the upper collar 336 is formed separately and attached as by fasteners 338 , 340 etc. to the housing 326 .
  • the upper fixed collar 336 is kept in snug relation to the upper flange generally designated 342 .
  • This flange 342 has a downwardly extending, cylindrical portion 344 and a wide flange portion 346 .
  • the portion 346 has a top surface which is planar, and mates in generally fluid-tight position with an upper flange 348 which has a cylindrical portion 350 attached in leak-proof position by threads or the like 352 to the upper inlet portion 353 .
  • An O-ring 354 ensures a seal between the flange 348 and the flange 346 when the flanges 346 , 348 are in facing relation and in snug engagements as will be described.
  • the lower collar generally designated 373
  • this unit is similar to its counterpart in that an upright cylindrical portion 375 is provided and a generally horizontal flange 379 is held in that position as by bearings 358 , 360 to enable it to rotate relative to the lower portion 382 .
  • the lower portion 382 is generally similar to its upper counterpart in FIG. 8 , and this includes an O-ring 386 which engages the face 389 of the flange 379 .
  • the portion 382 includes, in addition to the O-ring 386 , a horizontally extending flange 384 which is fastened by threads or the like 388 to a fixture 389 which is the uppermost portion of the drill string.
  • the surfaces 389 , 391 of the opposing flanges are ultimately made relatively mechanically tight and make a substantially fluid-tight connection.
  • a novel feature of the invention includes the two clamps generally designated 392 and 394 .
  • Each of these clamps each has a pair of tapered inner surfaces 396 , 398 , 400 , 402 as well as screw receiving bores 404 .
  • the tapered marginal mating surfaces 406 , 408 on one clamp are received within the surfaces 396 , 398 . Accordingly, when the clamp 392 has been tightened, these surfaces 406 , 408 remain extremely secure because their taper matches that of the surfaces 396 , 398 on the clamp.
  • There are counterpart surfaces for 420 , 422 which are ultimately engaged by surfaces 400 , 402 on the clamp 394 , thus holding the two flange 346 , 348 together.
  • FIG. 9 it is shown that, in a preferred construction, when it is time to release the clamps and remove the cartridge, a certain amount of axial play between the upper portion fixed collar 336 and the downwardly extending cylindrical portion 344 may be gained by unscrewing the threaded collar 351 . This lowers the cylindrical portion 344 and the flange 342 downwardly and enables the lower flange 342 to be more easily separated from the upper flange 348 .
  • a new cartridge containing the labyrinth and the elements described in connection with FIGS. 1 and 2 may readily be replaced, simply by slipping the entire cartridge into place, whereupon the flanges will be engaged by the clamps 392 , 394 and tightened down.
  • the O-rings 354 ensure a tight seal between parts which do not undergo relative rotation.
  • FIG. 9 also schematically shows that there are keyways 355 and locking pins or blades 356 in place so that the rotor disks and the stators remain fixed with their respective housing portions 322 , 326 .
  • the present invention provides a novel controlled leakage seal assembly having a number of advantages and characteristics, including those herein pointed out and others which are inherent in the invention.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
  • Joints Allowing Movement (AREA)
  • Earth Drilling (AREA)
  • Quick-Acting Or Multi-Walled Pipe Joints (AREA)
US11/427,196 2005-07-05 2006-06-28 Washpipe seal Expired - Fee Related US7213660B2 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US11/427,196 US7213660B2 (en) 2005-07-05 2006-06-28 Washpipe seal
PCT/US2006/025518 WO2007005576A2 (fr) 2005-07-05 2006-06-29 Garniture de tube d'usure
EP06785928A EP1899571A2 (fr) 2005-07-05 2006-06-29 Garniture de tube d'usure
CA002613872A CA2613872A1 (fr) 2005-07-05 2006-06-29 Garniture de tube d'usure
NO20080057A NO20080057L (no) 2005-07-05 2008-01-04 Trykkrortetning

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/174,687 US20070007002A1 (en) 2005-07-05 2005-07-05 Washpipe seal
US11/427,196 US7213660B2 (en) 2005-07-05 2006-06-28 Washpipe seal

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
US11/174,687 Continuation-In-Part US20070007002A1 (en) 2005-07-05 2005-07-05 Washpipe seal

Publications (2)

Publication Number Publication Date
US20070007044A1 US20070007044A1 (en) 2007-01-11
US7213660B2 true US7213660B2 (en) 2007-05-08

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Application Number Title Priority Date Filing Date
US11/427,196 Expired - Fee Related US7213660B2 (en) 2005-07-05 2006-06-28 Washpipe seal

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US (1) US7213660B2 (fr)
EP (1) EP1899571A2 (fr)
CA (1) CA2613872A1 (fr)
NO (1) NO20080057L (fr)
WO (1) WO2007005576A2 (fr)

Cited By (15)

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US20060042789A1 (en) * 2004-08-27 2006-03-02 Zbigniew Kubala Washpipe seal assembly
US20070251703A1 (en) * 2006-04-27 2007-11-01 National Oilwell Varco, L.P. Apparatus for Interconnecting and Sealing Between Fixed and Rotating Conduits and Methods of Installing Same
US20070251705A1 (en) * 2006-04-28 2007-11-01 Wells Lawrence E Multi-seal for top drive shaft
US20080210437A1 (en) * 2007-03-02 2008-09-04 Lawrence Edward Wells Top drive with shaft seal isolation
US20080230274A1 (en) * 2007-02-22 2008-09-25 Svein Stubstad Top drive washpipe system
US20090044982A1 (en) * 2006-04-28 2009-02-19 Wells Lawrence E Top drives with shaft multi-seal
DE102011052182A1 (de) * 2011-07-27 2013-01-31 Aker Wirth Gmbh Vorrichtung zur Herstellung eines Erdlochs
DE102014221000B3 (de) * 2014-10-16 2016-01-21 Eagleburgmann Germany Gmbh & Co. Kg Vormontierter Wechseleinsatz einer Bohrspüleinrichtung
DE102014221043B3 (de) * 2014-10-16 2016-02-04 Eagleburgmann Germany Gmbh & Co. Kg Bohrspüleinrichtung mit vormontiertem Wechseleinsatz
USD817751S1 (en) 2016-12-08 2018-05-15 3SC Global, LLC Union nut
USD846980S1 (en) 2016-12-08 2019-04-30 3SC Global, LLC Union nut
US10408328B1 (en) 2016-08-17 2019-09-10 Premium Oilfield Technologies, LLC Epicyclic washpipe swivel cartridge and method
US10538978B1 (en) * 2017-07-21 2020-01-21 Clark Seals, Ltd. Washpipe seal assembly
US10627026B2 (en) 2015-12-10 2020-04-21 3SC Global, LLC Fittings, components, and associated tools
US10712227B2 (en) 2017-02-14 2020-07-14 Nabors Drilling Technologies Usa, Inc. Washpipe life prediction

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ITTO20130694A1 (it) * 2013-08-14 2015-02-15 Umbra Meccanotecnica Giunto washpipe per un impianto di perforazione petrolifera
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CN107701500B (zh) * 2017-09-30 2019-05-24 中国航发沈阳发动机研究所 可转静子叶片传动密封结构
CN115217425B (zh) * 2022-08-13 2024-01-26 东营百华石油技术开发有限公司 一种反循环洗井装置

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US11028949B2 (en) 2015-12-10 2021-06-08 3SC Global, LLC Fittings, components, and associated tools
US11781684B2 (en) 2015-12-10 2023-10-10 3SC Global, LLC Fittings, components, and associated tools
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USD817751S1 (en) 2016-12-08 2018-05-15 3SC Global, LLC Union nut
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CA2613872A1 (fr) 2007-01-11
EP1899571A2 (fr) 2008-03-19
US20070007044A1 (en) 2007-01-11
NO20080057L (no) 2008-04-01
WO2007005576A2 (fr) 2007-01-11
WO2007005576A3 (fr) 2007-03-01

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